Rail for Self-Propelled Electric Trucks

ABSTRACT

Rail for self-propelled electric trucks, with the rail ( 2 ) having a base part ( 6 ) and C-shaped side flanks ( 8, 10 ) which engage over side wheels ( 12 ) of the truck ( 4 ). In order to improve the rail, each C-shaped side flank ( 8, 10 ) has a central running area ( 14 ), which is offset outwards, for side guide rollers ( 16 ) of the truck ( 4 ) and upper and lower supporting services ( 18, 20 ) which run at an angle to the wheel ( 12 ) for the side wheels ( 12 ), with the running area ( 14 ) and the supporting areas ( 18, 20 ) being used alternately.

This application claims priority of PCT application PCT/EP2005/012538 having a priority date of Nov. 23, 2005, the disclosure of which is incorporated herein by reference.

TECHNICAL FIELD

The invention concerns a rail for a self-propelled electric trolley.

BACKGROUND OF THE INVENTION

Rails of the type mentioned above are known from many examples.

CH 515 819 describes such a rail in which the C-shaped sides of the rails engage the side wheels of the trolley. The wheels in turn run on the upper or lower edges of the C-shaped sides. For lateral support, radially projecting support rims, which function in concert with the side parts of the sides of the rail, are provided along the circumferential running surfaces of the trolley wheels on the side facing away from the sides. Because they can be easily damaged, the support rims make the trolley wheels relatively complicated and vulnerable. The support rims may also cause damage to a surface on which the trolley is placed outside the rail. Finally, the rail is also relatively complicated, because it requires a ledge on which the support rims can be supported laterally to be present between the sides and the base part of the rail. In overhead suspension operation, the support rim exerts force on the outer edge of the sides, making it necessary for these parts to be of thick construction to prevent bending. They therefore require a relatively high amount of material and are thus costly.

WO95/14599 presents an improved rail in which the C-shaped sides connect evenly to the base part and no ledges are necessary. For the trolley wheels, the support rims are replaced by lateral guide wheels within the wheels, which abut the center of the sides. Because the guide wheels engage the center of the sides, less supporting force needs to be exerted by the sides and the rails can therefore be of lighter construction as a result of the supporting forces acting at a lower level. However, this rail may only be used by trolleys with lateral guide rollers.

SUMMARY OF THE INVENTION

The object of the invention is to create a novel type of rail, which allows mixed operation of trolleys with and without lateral guiding rollers.

If each C-shaped side features a central, outwardly displaced running area for the lateral guide rollers of the trolley and upper and lower support surfaces for the side wheel inclined towards the wheel, where the running areas and the support surfaces areas are used in alternation, then the rail can be used by both trolleys with simple wheels without support rims and by trolleys with lateral guide rollers. The simple wheels rest on the lower support surfaces when the trolley is driven on a normal level, or on the upper support surfaces when the trolley is driven suspended overhead. On trolleys with lateral guide rollers, these rollers abut the middle running area of the C-shaped sides of the rails. The novel rail thus facilitates mixed operation by both types of vehicles.

The special profiling of the C-shaped sides of the rails reduces the bending of the sides when overhead suspension is employed. Less material is required to construct the rail, while at the same time the trolley can be loaded more heavily. The space gained through the upper guide bevel of the side can be used for integrating the assembly grooves.

Advantageous configurations of the rails are detailed in the following exemplary embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS

The exemplary embodiments of the invention are described in greater detail with reference to the drawings, wherein:

FIG. 1 A rail with a trolley without lateral guide rollers, frontal view;

FIG. 2 A rail with a trolley with lateral guide rollers, frontal view

FIG. 3 The rail shown in FIGS. 1 and 2 without trolley;

FIG. 4 Diagrammatic illustration of the rail shown in FIG. 3;

FIG. 5 Side view of the connection between two rail segments;

FIG. 6 Side view of the connection between two rail segments with expansion joint;

FIG. 7 The rail shown in FIG. 3 only with power rails;

FIG. 8 The rail shown in FIG. 7 in section VIII-VIII from FIG. 7;

FIG. 9 The rail shown in FIG. 7 in section IX-IX from FIG. 7;

FIG. 10 Diagrammatic illustration of a concave rail segment;

FIG. 11 Diagrammatic illustration of a convex rail segment;

FIG. 12 Diagrammatic illustration of a laterally curved rail segment;

FIG. 13 A base segment part for connecting the sides of the rail shown in FIG. 12.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIGS. 1 and 2 show a cross section of a segment of a conveyor system that features rails 2 in which a self-propelled trolley 4 is arranged. One such rail 2 features a base part 6 and C-shaped sides 8, 10, which enclose the side wheels 12 of the trolley 4. The C-shaped sides 8, 10 each feature a central, outwardly displaced running area 14 for the lateral guide rollers 16 of the trolley, as well as upper and lower support surfaces 18, 20, each inclined towards the wheel 12. One and the same rail is thus suited for trolleys 4 that feature lateral guide rollers 16, as shown in FIG. 2, and for trolleys 4 without lateral guide rollers, but on which the wheels 12 simply abut the support surfaces 18, 20.

The wheels 12 and the guide rollers 16 are generally non-powered wheels or rollers without any drive function. Drive is provided on the one hand by a frictional wheel 22 functioning in concert with a corresponding frictional surface 24 of the rail 2, and/or a cog 26 functioning together with a cog rail 28 of the rail 2. Sliding contacts 30, 32, 34 function together with power rails 36, 38, 40 in the rail and serve to transmit current on the one hand and provide switching and control functions on the other hand.

The details of the rail and its function are illustrated in greater detail in FIGS. 3 through 13 and are further described below.

In the respective upper portion of the C-shaped sides 8, 10, the rail 2 features dovetailed assembly grooves 42, 44, which accommodate the clampable connection strips 46 for connecting adjoining rail segments 2 a, 2 b to one another. Additional assembly grooves 48, 50 for accommodating connection strips 46 are arranged on the bottom side of the base part 6 of the rail 2. To provide a secure connection between adjoining rail sections 2 a, 2 b, the connection strips 46 feature clamping screws 52 for each rail section 2 a, 2 b as FIG. 5 illustrates. To create an expansion joint 54 between segments 2 a, 2 b, the connection strips 46 are fastened to only one rail segment 2 b by means of clamping screws 52, while the connection strip 46 is displaceably arranged in the other rail segment 2 a as FIG. 6 shows.

The power rails 36, 38, 40 are fastened with the aid of sliders 56, which feature a block part 58 with molded feet 60, 62, which engage the dovetailed assembly grooves 64 of the rails 2. Driven dowel pins 66 between the feet 60, 62 prevent the sliders 56 from separating from the base part 6. In FIGS. 7 and 9, the dowel pins 66 are shown prior to being driven into the opening 68 between the feet 60, 62. Recesses 70 for accommodating the power rails 36, 38, 40 are arranged in the block part 58. Lateral to the block part 58 are snap-in pins 72, which feature snap-in hooks 74, 76 oriented away from one another, which function together with facing snap-in strips 78, 80 of the hollow power rails 36, 38, 40. To facilitate connection to a power supply, the heads 82 of contact screws 84 extending through the block part 58 of the slider 56 and the base part 6 of the rail 2 to the opposite side thereof are arranged in the power rails 36, 38, 40. As FIGS. 1 through 3 reflect, the contact screws 84 are secured by means of a first nut 86, while a second nut 88 serves for clamping the power supply connection 90.

Arranged on the bottom side of the base part 6 is an additional dovetailed assembly groove 92 for the purpose of fastening cable clips 94. The latter features clipping feet 96, 98, which engage the assembly groove 92 and between which a dowel pin 100 is arranged to prevent the feet from separating from the assembly groove 92. The cable clips 94 arranged at specific intervals on the bottom side of the base part 6 serve to hold all types of lines such as power supply lines and control lines. The bottom side of the base part 6 can also ultimately be covered with a cover 102 that features side fastening strips 104, 106 that engage corresponding insert grooves 108, 110 on the bottom side of the base part.

An additional dovetailed assembly groove 112 for securing the cog rail 28 is arranged on the top side of the base part 6.

A rail of this kind can be bent to form an inside curve as shown in FIG. 10 or an outside curve as shown in FIG. 11. For this purpose, the rail can be bent as a whole unit in the manner shown.

To form an inside or outside curve as shown in FIG. 12, the C-shaped sides 8 a and 10 a must be individually bent according to the desired curvature radius and then connected to one another using the base segment parts 6 a.

The new rail is suited not only for mixed operation by trolleys with and without lateral guide rollers, but, thanks to the assembly grooves and the insert-and-clip connections, can be employed universally, is easy to retrofit, and can be assembled quickly and easily. Rails can be removed and later reused in a simple manner. No complicated tools are required.

Reference number list  2 Rail  2a, 2b Rail segment  4 Trolley  6 Base part  6a Base segment part  8, 8a C-shaped side  10, 10a C-shaped side  12 Wheel  14 Running area  16 Guide roller  18, 20 Support surface  22 Frictional wheel  24 Frictional surface  26 Cog  28 Cog rail  30, 32, 34 Sliding contact  36, 38, 40 Power rail  42 Assembly groove on 8  44 Assembly groove on 10  46 Connection strip  48 Assembly groove on 6  50 Assembly groove on 6  52 Clamping screw  54 Expansion joint  56 Slider  58 Block part  60, 62 Foot  64 Assembly groove  66 Dowel pin  68 Opening  70 Recess  72 Snap-in pin  74, 76 Snap-in hook  78, 80 Snap-in strip  82 Head  84 Contact screw  86 First nut  88 Second nut  90 Power supply connection  92 Assembly groove  94 Cable clip  96, 98 Foot 100 Dowel pin 102 Cover 104, 106 Fastening strip 108, 110 Insert groove 112 Assembly groove for 28 

1. Rail for self-propelled electric trolley, whereby the rail features a base part and C-shaped sides, which enclose lateral wheels of the trolley, characterized in that each C-shaped side features a central, outwardly displaced running area for lateral guide rollers of the trolley as well as upper and lower support surfaces for the lateral wheels, each inclined towards the wheel, so that one and the same rail is suitable for trolleys having lateral wheels with guiding rollers as well as without guiding rollers, wherein the wheels are supported on the lateral supporting surfaces of the rail in the latter case.
 2. Rail as in claim 1, characterized in that the outside of its profile features dovetailed assembly grooves for accommodating clampable connection strips for connecting neighboring rail segments.
 3. Rail as in claim 2, characterized in that at least two assembly grooves are arranged on the base part.
 4. Rail as in claim 2, characterized in that an assembly groove is arranged in each of the sides preferably in the top area.
 5. Rail as in claim 2, characterized in that to create an expansion joint between neighboring segments, the connection strip is clamped in only one rail segment and displaceably arranged in the other rail segment.
 6. Rail as in claim 1, whereby said rail features dovetailed assembly grooves for accommodating attachments on the inside of the base part, characterized in that it features multiple sliders arranged in intervals over the length of the rail and perpendicular to the rail, each of which features feet clipped into the assembly grooves with dowel pins driven between the feet.
 7. Rail as in claim 6, characterized in that on the side facing away from the fastening side, each slider features recesses oriented with the rail for accommodating power rails.
 8. Rail as in claim 7, characterized in that assigned to each recess are snap-in pins, which feature snap-in hooks oriented away from one another, which function together with facing snap-in strips of the hollow power rails.
 9. Rail as in claim 1, characterized in that arranged in the base part of the rail are openings for accommodating contact screws for the segment-by-segment connection of lines to the power rails.
 10. Rail as in claim 1, characterized in that on the bottom side of the base part it features a dovetailed assembly groove in which the cable clips are installed by means of clippable feet, between which dowel pins are arranged.
 11. Rail as in claim 1, characterized in that facing insert grooves for accommodating the fastening strips of a cover are arranged at opposite edges of the bottom side of the base part.
 12. Rail as in claim 1, characterized in that a dovetailed assembly groove for clipping a cog rail as needed is arranged on the top side of the base part.
 13. Rail as in claim 1, characterized in that it is bent to an inside curve or outside curve.
 14. Rail as in claim 1, characterized in that it is formed into an inside curve or outside curve, whereby the sides are bent according to the curvature radius and the base part is formed by base segment parts, which connect the sides to one another.
 15. Rail as in claim 3, characterized in that an assembly groove is arranged in each of the sides, preferably in the top area.
 16. Rail as in claim 3, characterized in that to create an expansion joint between neighboring segments, the connection strip is clamped in only one rail segment and displaceably arranged in the other rail segment.
 17. Rail as in claim 4, characterized in that to create an expansion joint between neighboring segments, the connection strip is clamped in only one rail segment and displaceably arranged in the other rail segment.
 18. Rail as in claim 2, whereby said rail features dovetailed assembly grooves for accommodating attachments on the inside of the base part, characterized in that it features multiple sliders arranged in intervals over the length of the rail and perpendicular to the rail, each of which features feet clipped into the assembly grooves with dowel pins driven between the feet.
 19. Rail as in claim 3, whereby said rail features dovetailed assembly grooves for accommodating attachments on the inside of the base part, characterized in that it features multiple sliders arranged in intervals over the length of the rail and perpendicular to the rail, each of which features feet clipped into the assembly grooves with dowel pins driven between the feet.
 20. Rail as in claim 4, whereby said rail features dovetailed assembly grooves for accommodating attachments on the inside of the base part, characterized in that it features multiple sliders arranged in intervals over the length of the rail and perpendicular to the rail, each of which features feet clipped into the assembly grooves with dowel pins driven between the feet.
 21. Rail as in claim 5, whereby said rail features dovetailed assembly grooves for accommodating attachments on the inside of the base part, characterized in that it features multiple sliders arranged in intervals over the length of the rail and perpendicular to the rail, each of which features feet clipped into the assembly grooves with dowel pins driven between the feet. 